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First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17

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arxiv 1602.05939 v3 pith:U5TQ5COB submitted 2016-02-18 physics.ins-det astro-ph.COastro-ph.IMhep-ex

First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17

DM-Ice Collaboration: E. Barbosa de Souza , J. Cherwinka , A. Cole , A. C. Ezeribe , D. Grant , F. Halzen , K. M. Heeger , L. Hsu
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A. J. F. Hubbard J. H. Jo A. Karle M. Kauer V. A. Kudryavtsev K. E. Lim C. Macdonald R. H. Maruyama F. Mouton S. M. Paling W. Pettus Z. P. Pierpoint B. N. Reilly M. Robinson F. R. Rogers P. Sandstrom A. Scarff N. J. C. Spooner S. Telfer L. Yang
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classification physics.ins-det astro-ph.COastro-ph.IMhep-ex
keywords darkmatterdm-ice17experimentfirsthemispheremodulationsignal
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We present the first search for a dark matter annual modulation signal in the Southern Hemisphere conducted with NaI(Tl) detectors, performed by the DM-Ice17 experiment. Nuclear recoils from dark matter interactions are expected to yield an annually modulated signal independent of location within the Earth's hemispheres. DM-Ice17, the first step in the DM-Ice experimental program, consists of 17 kg of NaI(Tl) located at the South Pole under 2200 m.w.e. overburden of Antarctic glacial ice. Taken over 3.6 years for a total exposure of 60.8 kg yr, DM-Ice17 data are consistent with no modulation in the energy range of 4-20 keV, providing the strongest limits on weakly interacting massive particle dark matter from a direct detection experiment located in the Southern Hemisphere. The successful deployment and stable long-term operation of DM-Ice17 establishes the South Pole ice as a viable location for future dark matter searches and in particular for a high-sensitivity NaI(Tl) dark matter experiment to directly test the DAMA/LIBRA claim of the observation of dark matter.

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